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CUCM Connection to the Server cannot be established(Certificate Exception)

CUCM Connection to the Server cannot be established(Certificate Exception)


Are you facing issue with Cisco Unified Communication Manager giving you error “Connection to the Server cannot be established(Certificate Exception)” after a DRF Restore? If yes, then you have to follow the below steps in order to resolve the issue.

  • Login to Cisco Unified Communication Manager Platform GUI > https://x.x.x.x/cmplatform
  • Go to Security > Certificate Management > Click on Find
  • Verify if “tomcat.pem” certificate has been expired. If yes, the click on tomcat link and Regenerate the certificate. Validate the certificate in Publishers and Subscribers and regenerate wherever certificate expired.

  • ¬†Restart Cisco Tomcat Service by Logging into Publishers/Subscribers CLI on which Certificates were regenerated by running the command “utils service restart Cisco Tomcat”
  • Try to access Service Pages Nodes from Publisher and the subscriber nodes should be accessible. If not, try rebooting the cluster.

Hope this helps!!

Published by Team UC Collabing

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Electrical Engineer CCNA Collaboration CCNA Voice CCNA R&S. I'm Electrical Engineer and I work like Support Engineer for a Telephony Service Provider Company. Before that I had position like Pre-Sale Engineer about small and medium multivendor telephony solutions. I have 5 years of experience working in Telephony Multivendor Projects. I am also 3 years of experience working in Support and implementation about Cisco Collaboration platforms: UCS server, UCM, Cisco Unity, Presence Server, Jabber, Gateway. Support Community is most useful in finding design, implementation and support tricks and shortcuts that greatly help me in my daily activities. If you need to contact me, please you can writte me.


CCNA Routing and Switching
Am a technology enthusiast. I work in network support providing support with implementation, maintaining and precisely troubleshooting the infra.
Realm of collaboration makes me want to learn and face new challenges more and more.